* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    width: 400px;
    min-height: 600px;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: #f5f7fa;
    overflow-x: hidden;
}
